Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Mar. 15, 2022	Feb. 11, 2022	Feb. 04, 2022	Dec. 31, 2021	Mar. 07, 2022	Feb. 10, 2022	Jan. 27, 2022	Jan. 26, 2022	Sep. 20, 2021
Line of Credit | Notes Payable to Banks
Subsequent Event [Line Items]
Facility Limit				$ 1,250,000
Barclays Bank PLC | Line of Credit | Notes Payable to Banks
Subsequent Event [Line Items]
Facility Limit				$ 400,000					$ 400,000
Barclays Bank PLC | Line of Credit | Notes Payable to Banks | Minimum | LIBOR
Subsequent Event [Line Items]
Interest rate spread (as a percent)				1.70%
Barclays Bank PLC | Line of Credit | Notes Payable to Banks | Maximum | LIBOR
Subsequent Event [Line Items]
Interest rate spread (as a percent)				3.50%
Veritex Community Bank | Line of Credit | Notes Payable to Banks
Subsequent Event [Line Items]
Facility Limit				$ 50,000
Veritex Community Bank | Line of Credit | Notes Payable to Banks | LIBOR
Subsequent Event [Line Items]
Interest rate spread (as a percent)				2.30%
Banc of California, National Association | Line of Credit | Notes Payable to Banks
Subsequent Event [Line Items]
Facility Limit				$ 50,000
Banc of California, National Association | Line of Credit | Notes Payable to Banks | Minimum | LIBOR
Subsequent Event [Line Items]
Interest rate spread (as a percent)				2.50%
Banc of California, National Association | Line of Credit | Notes Payable to Banks | Maximum | LIBOR
Subsequent Event [Line Items]
Interest rate spread (as a percent)				3.13%
Subsequent Event
Subsequent Event [Line Items]
Dividends declared per share of common stock (USD per share)	$ 0.45
Subsequent Event | Barclays Bank PLC | Line of Credit | Notes Payable to Banks
Subsequent Event [Line Items]
Facility Limit							$ 550,000	$ 400,000
Subsequent Event | Deutsche Bank AG | Line of Credit | Notes Payable to Banks | SOFR
Subsequent Event [Line Items]
Interest rate spread (as a percent)			0.00%
Subsequent Event | Deutsche Bank AG | Line of Credit | Notes Payable to Banks | Minimum
Subsequent Event [Line Items]
Interest rate spread (as a percent)			2.20%
Subsequent Event | Deutsche Bank AG | Line of Credit | Notes Payable to Banks | Maximum
Subsequent Event [Line Items]
Interest rate spread (as a percent)			3.45%
Subsequent Event | Veritex Community Bank | Line of Credit | Notes Payable to Banks
Subsequent Event [Line Items]
Facility Limit		$ 75,000				$ 50,000
Subsequent Event | Veritex Community Bank | Line of Credit | Notes Payable to Banks | Minimum | SOFR
Subsequent Event [Line Items]
Interest rate spread (as a percent)		2.41%
Subsequent Event | Veritex Community Bank | Line of Credit | Notes Payable to Banks | Maximum | LIBOR
Subsequent Event [Line Items]
Interest rate spread (as a percent)		3.125%
Subsequent Event | Banc of California, National Association | Line of Credit | Notes Payable to Banks
Subsequent Event [Line Items]
Facility Limit					$ 75,000